问题 问答题

在2008年初的南方雪灾中,连续的寒冷天气使气温长期在0℃以下,我们在电视中看到这样一个现象:当路面结冰汽车无法行驶时,护路工人在路面上撒大量的盐,路面上的冰会在0℃以下熔化,从而使交通畅通.

(1)请你就这个现象提出一个物理问题.并针对你提出的问题作出合理的猜想.

(2)要使汽车能在雨雪路面上行驶,还可采用其它什么方法?并说明理由.(说出一条即可)

答案

答:(1)提出问题:加入盐后,为什么冰在0℃以下就可以熔化呢?

猜想:加入盐后,冰的熔点降低了.

(2)可在汽车轮上加防滑链.这样可以加大汽车轮与路面的摩擦力,从而使汽车能安全行驶.

阅读理解

阅读理解。

        1   One of the best things you can possibly do is to start you own club. It's great fun especially if you

are the sort of person who feels there's never anything to do during the school holidays.

     The first thing you need to come up with is an idea for your club.    2   Pets, clothes, pop music or

dancing groups, sports, making things? The list is endless.

     Next you need some friends to be in your club with you.   3   All you need is three or four other people

who are interested in the same thing as you.

         4    You should all sit down somewhere together with lots of pieces of paper and write down every

name you can think up. That'll keep you busy for ages.

     At your first meeting you should make up a rule book. And the first rule should be no grown-ups or

little/big brothers or sisters! The best clubs are always secret!

     Now you have just about everything you need, except membership cards. These are very important and

again you can speed a lot of time making them.    5    Why not leave some space for a photo of yourself?

That will make the membership card really look like it.

     So there you are, get clubbing! Once you get started you'll think of loads of more interesting things to

do!

A. That's easy.

B. Enjoy your own club!

C. Invite a designer to join you.

D. What are you interest in?

E. Some vacation is just around the corner.

F. Then you need to pick a name for your club.

G. Use a bright thick pen to make a special design.

单项选择题 A1型题